Glass-grinding apparatus.



- G. A. MAGBETH.

GLASS GRINDING APPARATUS. APPLICATION rum) 1mm, 191-2.

1,1 1 5 160; Patented 0ct.20,1914.

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GEGRG'E A. MACBETI-I, OF PITTSBURGH, PENNSYLVANIA.

rarities.

Specification 01' Letters Patent.

GLASS-GRINDING APPARATUS.

Patented fiat. 23th Application filed April}, 1912. Serial Ito. 689,269.

To all whom it may concern:

Be it known that I, GEORGE A. MACBETH, a citizen of the United States, residing in Pittsburgh, in the county of Allegheny and State of Pcnnsylvanim have invented certain new and useful Improvements in Glass- Grinding Apparatus, of which the following is a specification.

This invention has reference to glass grinding apparatus and it has for its primary objects the provision of improved means for supplying abrasive material to the grinding surfaces, and the provision of improved means for maintainin the abrasive in proper suspended condition and dirccting a substantially continuous discharge or application of the abrasive at any place desired on the grinding surfaces. This together with such other objects as may hereinafter appear or may be incidental to my invention I attain by means of a construction which I have illustrated in preferred form in the accompanying drawings wherein:-- Figure l is a longitudinal section througha grinding mechanism showing the applica tions of my improved apparatus, Figure 2 is a plan view of the mechanism shown in Figure 1, and Figure 3 is an enlarged detail view of my improved agitating and directing mechanism. One of the chief ob jects of my invention is to provide a simple means for effectively agitating the abrasive ing, it wiii mixture utilized in grinding glass articles so as to maintain it in proper suspended condition, and at the same time to secure a substantially continuous spray or discharge of the abrasive onto the grinding surfaces, at

just the place where it may be desired or will be most effective.

Referrin to Figures 1 and 2 of the drawbe seen that I have diagrammatically illustrated a grinding wheel or table 5 which is provided with a grinding surface 6 adjacent the edge of which is an annular groove or channel 7 which is adapted to contain the mixture of water and abrasive material utilized in' grinding the glass, the edge having an annular upstanding flange 7 The grinding table is mount ed on the sha t 8 so as to rotate therewith, the shaft Sbeing operated by any desired form of mechanism.

tunnel or horn 9 which is supported in position in the channel 7 by means of the two-part arm or bracket 10 which 15 bolted The ab asive is dis-. charged onto the table by means of the hi the bracket 11 which may be integral with or secured to any desired part of the frame work of the apparatus. In Figure 1 I have shown this bracket as being formed intogral iy with the upper bearing 12 of the shaft 8. he two parts of the bracket 10ers secured together by means of the bolt 13, the upper portion being slotted at 14 to permit of vertical adjustment of the tunnel 9. The discharge spout 15 of the funnel 9 is bent substantially at right angles to the body oi. the funnel so as to secure a lateral discharge of the abrasive onto vthe table, or onto t 3 glass article being ground. In the drawin I have illustrated the grinding of a lanfip chimney 16 with the funnel arranged so that the abrasive will be discharged just in advance of the chimney. -ln operation the rotation of the table 5 will drive or force a portion of the abrasive mixture into the funnel and secure a substantially continuous discharge of the same from the spout 15 onto the table and at the same time the abrasive mixture in the disc nel 7 will be thoroughly agitated and the sand or other abrasive material will be main tained in suspended condition. The device is simple and eiiective and secures uniformity of grinding.

Having thus described my invention and illustrated its use, What I claim as new and useful and desire to secure by Letters Pate cut is the following:

1. In glass grinding apparatus the combination with a rotary grinding table adapted. to contain an abrasive mixture, a relatively stationary horn adapted to discharge a stream of abrasive onto the grinding surface of the table, and a supporting member; for the horn adjustably mounted in such man nor that the elevation and angular'inclination of the horn may be varied.

2. In glass grinding apparatus, the combination with a rotating receptacle adapted to contain abrasive material, a grinding menu" ber rotatable with the receptacle, and a stationary conduit having a portion thereoflyv ing in position in the said receptacle to scoop up the abrasive and discharge it onto the grinding member when the receptacle is rotated.

3. In glass grinding apparatus, the combination of a rotary member comprisi'nga grinding disk and a channel about its periphery adapted to contain an abrasive ma terial, and a conduit one end of. which lies in the ehannei in position to scoop-up the abrasive When the said member is rotated,

and theother end of which lies in position to dischargethe-abrasive scooped up onto the disk.

4. In combination, e rotary member comprising e grinding member end a receptaoie surrounding the same, and e tapering horn having its large enti lying in the reee pteole and its small end in position to disoherge onto the grinding member,

5. In combination, a rotary member coin- 

